HSK 6
嘛
ma助
modal particle indicating that sth is obvious; particle indicating a pause for emphasis
别担心嘛，事情会解决的。
Bié dān xīn ma, shì qíng huì jiě jué de.
Do not worry; the matter will be resolved.
Say it
Hold the button, say it, then let go.
Also free:
New in the HSK 3.0 word list at level 6.